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CHARLES Ii. 'IQMPKIN` OF ROCHESTER, NEW YORK,

'Leners Patent N0.l A71,341, flared November 2e, 1867.

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TO ALL VHOM IT MAY CONCERN:

Beit known vthat I', CHARLES R. ToMPKxNs, of the city of Rochester,county of Monroe, and State of New York, have invented a new and' usefulImprovement in the Manner of Adjusting Rotary-Cutter Heads y to thework, and of securing the same to the revolving shaft; and I do herebydeclare that the followingis a full, clear, and exact description of theconstruction and operation o't the`same, reference being hadto theannexed drawings, making a', part of these specficatious, in which-Figure 1 is an outside view,

Figure 2 an inside elevation, i

Figure 3 a'face view of the same.

Similar letters oi' reference indicate corresponding parts in theseveral figures.

The nature of my invention consists in constructing a rotary-cutterhead, of any known form, with a hub or suitable projection, a, fig. 1,to receive the sleeve c. Into this hub I cut a screw as far as isnecessary` to give the requisite amount ot' lateral traverse to the headin adjusting the same. The sleeve c has a correspond.-

ing screw cut upon the outsiden of it, and is closely fitted into hub a,iig. 2. This sleeve, e, may be ittedcn the outside of huh cz, and thescrews reversed; in some instances it is more convenient to do so. fl'he shaft b isthen fitted to thc head as far as t, iig. 2, and has apin or other -suitable projection fitting into the slot g, for thepurpose of driving the head when at work, and also to prevent it from'turning on shaft b while the sleeve c is being turned for the purpose ofadjusting the head sidewise to its proper position, The shaft b isturned smaller at t, iig. 2, in order to receive the sleeve c, and allowit to revolve to the right or left, as mayberequircd, the end of sleevec resting against the shoulder of sha-ft b at l.. Upon the end of lshaft6 a nut, al, figs. 1 and. 2, is fitted, so that when it is screwed downit brings the sleeve e in Contact with the shoulder of the` shaft l1 atL,

holds it rmly in position. Instead of the pin and slot g, gs. 2 and 3, aset-screw, e, may be insertedto fit into a corresponding groove in theshaft. The openings z'z' are to receive the cutters, and are fastenedmeans of set-screws ff. i y

To enable others to understand the usc of my invention, I will brieflydescribe the mannerof operating the same. i

The operator places the head upon the shaft I), the'nutal and sleeve chaving been previously `taken off. He then slides sleeve c upon thatpart of the` shaft that is turned down to receive it, until it comes incontact with the shoulder at t, 2. The nut ci is then screwed on` so asto press against sleeve c, but not s o tight but that` it may be readilyturuedto the right or left bythe hand of the operator. The threads ofthe screw on sleevec are brought in contact with those in hub a; and, asthe sleeve c is turned backward or forward,- the head is forcedlaterally on theshaft until the cutters are brought to their properposition, when the nut d may be i screwed down firmly, and the wholeheld in position until necessary to change it. Any number of `heads mayhe fitted to the same sleeve, each having dierent-shaped cutters, forthe purpose of doing tvariety of work with the same machine.

What I claim as my invention, anddesire to secure by Letters Patent, is

i The application to rotary-cutter heads, of the revolving sleeve c,with its screw, the shouldered shaft h, and.`

the nut (l, in connection with the pin and slot g, or set-screw e, Vforthc purpose herein set forthand substantiallj,r as described. i y

CEAS. R. TOMPKINS. Witnesses:

GEO. FRAUENBERGER,

Guo. Ercnomv.

